I would rather nitrogen be selectable when creating a save, such as I select "Survival" then "Nitrogen" is checked off.

================Anom================
"Open windows, closing doors,
God can't help us anymore!
Souls forever, come and go,
Burn all the bridges and fire in the hole!"
================Anom================

Isn't that a command that used to be in-game, that you would take damage if you ascended more than a couple 100 meters at a time, but you would get more oxygen?
(/nitrogen, right?)

Life is a window. It is just a scream into the darkness, passing the time until all of you, your memories, and all of humanity slowly fade into the void that is death. As your window closes, you will know that life is just the fight against it, even though it is just a constant in life. Death is the Impending Doom, the one force that always prevails, the true entity that connects and binds us all. All problems, either big or small, amount to nothing. The one possible savior to this world and everything in it is our own universal mortality. Once we realize this, society might finally become true and pure, and all will be at peace.